257655638346 has 32 divisors (see below), whose sum is σ = 518554820160. Its totient is φ = 85345298304.

The previous prime is 257655638321. The next prime is 257655638347. The reversal of 257655638346 is 643836556752.

It is a self number, because there is not a number n which added to its sum of digits gives 257655638346.

It is not an unprimeable number, because it can be changed into a prime (257655638347) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1455336 + ... + 1622748.

It is an arithmetic number, because the mean of its divisors is an integer number (16204838130).

Almost surely, 2^257655638346 is an apocalyptic number.

257655638346 is an abundant number, since it is smaller than the sum of its proper divisors (260899181814).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257655638346 is a wasteful number, since it uses less digits than its factorization.

257655638346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169030.

The product of its digits is 108864000, while the sum is 60.

The spelling of 257655638346 in words is "two hundred fifty-seven billion, six hundred fifty-five million, six hundred thirty-eight thousand, three hundred forty-six".